Steam-boiler furnace.



PATBNTBD DEG. zz, 190s.

J. W, STILLWBLL. STBAM'BOILBR PURNAGB.

APPLIGATION HLBD'MLR. 2'. 1903. 7

2 SHEETS-SHEET 2J No MODEL.

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UNITED STATES Patented December 22, 1903*.

JosEPH w. sTILLwELL, on NEwYoEK, N. Y.

STEAM-BOILER FURNACE.v

SPECIFICATION forming part of Letters Patent No. 747,797, dated December 22, 1903. Application filed March 2, 1903. Serial No. 145.704. (No model.)

To a/ZZ whom t concern:

Be it known that I, JOSEPH W. STILLWELL, a citizen of the United States, residing in the city of New York, borough of Brooklyn,

county of Kings, and State of'New York,

have invented certain new and useful;Im-

. the total and perfect combustion of all the inflammable constituents of the fuel u'sed in heating steam-boilers, so that only carbonio acid and otherincombustible products of combustion are allowed to escape to and through the chimney. I

It is well known that all flame is extinguished on enteringthe tubes ot' a boiler, so that all volatile and gaseous products emahating from the fuel excepting the portions thereof actually and immediately consumed in the fire-box escape -unconsumed to the chimney, together with more or less'carbon in solid form, resulting in smoke, so called, and in a loss approximately in some cases of vnearly one-half the heating capacity of the fuel.

The main object of my invention is to ob-V vate smoke by preventing its formation, and

this I accomplish by returning the unconsumed products of combustion after they pass through the boiler-fines to the fire-box' by means of a forced draft or 4suction cre-- ated by the injection of steam, preferably superheated, into a return-flue, by which-thecombustible matter.

In the accompanying drawings, Figure 1 is acentral Vertical sectional elevation upon plane of line l 1, Fig; 3, of a boiler and furnace in which the chimney is situated at the front of the' furnace. Fig. 2 is a horizontal sectional elevation upon plane of line 2 2, Fig. 3, the boiler-shell being omitted. Fig.

3 is a front elevation. Fig. 4 is a transverse section upon plane of line 4 4, Fig. l. Fig. 5 is a View similar tol, showing a boiler 1 and furnace in which the chimney is arranged at -therear thereof., Fig. 6- isa horizontal v section on plane of line 6 6, Fig. 5. Fig.` 7is a sectional detail showing means'for injecting steam into the ue by which the products of combustion are returned to the fire-box.

. I herein show and describe means for carrying out my invention practically in connection with horizontal tubular boilers, although Ido not confine myself to that class of boilers nor lheidentical form and construction of parts shown, since it is obvious Ibox of theiurnace. *l

It is to be understood that the main partsl hereinafter described are preferably dupli-V cated on opposite sides of the furnace and boiler. A

F F represent the furnace-walls or framework; B, a horizontal tubular boiler mounted therein.

fis the fire-box or combustion-chamber, into which the fuel'is introduced in the usual way.

VThe products of combustion from the firebojr f pass over the bridges f f2 through the tubes b of the boiler B and into the passage c, which leads to the chimney C. In the passage c between the boiler-tubes b and the chimney C is interposed the open mouth e of a pipe or conduit E, which extends tothe fire-box f, so that theproducts of combustion drawn into the open mouth c may be returned directly to said tire-box. This return of the products of combustion is positively assured by the injection of steam through a suitable nozzle G into the said conduit E, the steam being injected in the direction of said tirebox, so that an induced current is created within the conduit E.

The conduit E Where it passes underneath the boiler B is preferably exposed directly to the heat of the products of combustion escaping from the ire-box f on theirway to the rear end of the boiler'B, so that saidconduit E becomes highly heated. In like manner the steam-pipe g for conducting steam to the steam-nozzle G is preferably exposed to the direct heat of the products of combustion passing from the dre-box f, so as to superheat the steam prior to its introduction into said return-pipe E.

Steam may be supplied to the pipeg either directly from the steam-dome b of the boiler through the pipe 71, or from an independent source through the pipe t'. The pipe i may be connected with a supply of exhaust-steam, if desired, Valves z" and h being provided, whereby one source of supply may be cut off While the other is utilized.

In operation the carbonio dioxid, hydrogen,and unconsumed carbon passing over the bridges ff2 and through the fines bof the boiler B are returned in Whole or in part through the conduit E to the fire-box f by the induction or suction created bythe injection of superheated steam through the nozzle G into the lower arm of the conduit E,V the hydrogen and oxygen of the steam mingling with the products of combustion thus returned and insuring their perfect reduction to carbonio acid in said lire-box, at the saine time adding to the heat generated therein by their own combustion and reduction. I thus not only attain the perfect combustion of all the combustible constituents of the fuel, but by reason of the increased draft created am enabled to use cheaper grades of fuel with satisfactory results.

What l claim as my invention, and desire to secure by Letters Patent, is-

l. The combination with a steam-boiler and furnace, of fines arranged adjacent the side Walls of the furnace with open ends in the passages between the boiler-tubes and the chimney and their other ends terminating in close proximity to the grate and turned at an angle to their length and steam-pipes arranged adjacent the side Walls of the furnace and connected with the combustion-dues at points remote from the grate, and at points farthest from the chimney to inject the steam horizontally into said dues, substantially as described.

2. The combination with a furnace and steam-boilerof conduits for returning unconsinned products of combustion from beyond the boiler-tubes to the fire-box, said returnconduits being extended. above the boiler, downwardly at the rear end and horizontally below the boiler through the path of the products of combustion escaping from the fire-box adjacent the side Walls of the furnace, together with means arranged Within the furnace adjacent the side Walls thereof for injecting steam under pressure into said return-conduit, said steam-injecting means being arranged to discharge into the rear ends of the lower horizontal portions of said conduits, for the purpose set forth.

3. The combination with a furnace and steam-boiler,0f conduits for returning unconsumed products of combustion from beyond the boiler-tubes to the fire-box, said conduits extending horizontally below the boiler adjacent the side walls of the furnace, vertically at the rear end of the boiler and horizent-ally above the boiler, the outlets of said conduits being above the grate, and steaminjecting pipes arranged adjacent opposite side walls of the furnace and constructed to discharge steam into said conduits at the rear ends of the lower horizontal portions thereof.

JOSEPH W. STILLWELL.

Witnesses:

FRANK E. RoAcH, D. W. GARDNER. 

